[Bug middle-end/50199] [4.7 Regression] wrong code with -flto -fno-merge-constants

["rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50199

--- Comment #9 from rguenther at suse dot de <rguenther at suse dot de> 2012-01-04 13:02:26 UTC ---
On Wed, 4 Jan 2012, hubicka at gcc dot gnu.org wrote:

> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50199
> 
> --- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> 2012-01-04 12:57:28 UTC ---
> I agree that ignoring the bug or adding sorry refusing -fno-merge-constants
> -flto is probably only way to deal with it in 4.7.
> 
> If we go the way translating into initialized vars, we probably could translate
> string constants as easilly as const_decls, so perhaps there is no frontend
> change needed at all.
> 
> In general it would be very useful to have pass tagging ADDR_EXPRs on whether
> the address of object taken needs to be unique or can change freely. This would
> be useful at several places in IPA and also we could then only promote some of
> the const decls.

Well, whether or not is the Frontends burden to decide.  And if not,
it has to use an ADDR_EXPR of a CONST_DECL.

Richard.